Magnetic dephasing in mesoscopic spin glasses.

We have measured universal conductance fluctuations in the metallic spin glass Ag:Mn as a function of temperature and magnetic field. From this measurement, we can access the phase coherence time of the electrons in the spin glass. We show that this phase coherence time increases with both the inverse of the temperature and the magnetic field.

Strong tunable coupling between a superconducting charge and phase qubit.

We have realized a tunable coupling over a large frequency range between an asymmetric Cooper pair transistor (charge qubit) and a dc SQUID (phase qubit). Our circuit enables the independent manipulation of the quantum states of each qubit as well as their entanglement. The measurement of the charge qubit's quantum states is performed by an adiabatic quantum transfer from the charge to the phase qubit.

Cooper-pair pump as a quantized current source.

A new charge quantization in a phase-polarized Cooper-pair pump is proposed, based on the topological properties of its Hamiltonian ground state over a three-dimensional parameter space P. The charge is quantized using a set of paths in P covering the surface of a torus, and is a multiple of the integer Chern index c1 of this surface. This quantization is asymptotic but the pumped charge converges rapidly to the quantized value with the increase in the path frequency.

NMR investigation of how free composite fermions are at nu=1 / 2.

NMR measurements of the electron spin polarization (P) have been performed on a 2D electron system at and around half-filled lowest Landau level. Comparing the magnetic field and the temperature dependence of P to models of free and interacting composite fermions (CF), the imbalance of spin-up and spin-down CF Fermi seas is mapped as a function of Zeeman energy. Independent measurements of the CF effective mass, g factor, and Fermi energy are obtained from the thermal activation of P in tilted fields.

Resonant Cooper pair tunneling through a double-island qubit.

We have measured transport in the Coulomb blockade regime through a quantum system consisting of two superconducting islands coupled by a Josephson junction. The double island is weakly connected to leads by small superconducting tunnel junctions. At low bias voltages, a new resonant transport process for Cooper pairs is observed.

New phase transition between partially and fully polarized quantum Hall states with charge and spin gaps at nu = 2/3.

The average electron spin polarization Rho of a two-dimensional electron gas confined in GaAs/GaAlAs multiple quantum wells was measured by NMR near the fractional quantum Hall state with filling factor nu = 2/3. Above this filling factor (2/3< or = nu < 0.85), a strong depolarization is observed corresponding to two spin flips per additional flux quantum.

NMR determination of 2D electron spin polarization at nu = 1/2.

Using a "standard" NMR spin-echo technique we determined the spin polarization P of two-dimensional electrons, confined to GaAs quantum wells, from the hyperfine shift of Ga nuclei located in the wells. Concentrating on the temperature ( 0.05 less, similarT less, similar10 K) and magnetic field ( 7 less, similarB less, similar17 T) dependencies of P at Landau level filling factor nu = 1/2, we find that the results are described well by a simple model of noninteracting composite fermions, although some inconsistencies remain when the two-dimensional electron system is tilted in the magnetic field.

Reconciliations with parents as a treatment goal for adolescents in an acute care psychiatric hospital.

Adolescents admitted to a psychiatric hospital frequently experience intense anger towards their parents and are often estranged from them. This reflects the problem both patient and parents have coping with the developmental task of separation and individuation. The authors discuss the importance of treatment to achieve reconciliation in order to facilitate the adolescents' move toward autonomy.

The integration of the Foster Grandparent Program with an acute Care Psychiatric Service.

In an effort to provide special relationships and attention for the children and adolescents hospitalized on the acute care psychiatry wards, one hospital established a unit of foster grandparents. The article describes the problems encountered in the development of similar programs, particularly in multidiscipline settings. The article also describes how the foster grandparents became active members on the service's multidiscipline teams, participating in the assessment of patients and contributing to their treatment.